139073213 has 4 divisors (see below), whose sum is σ = 139221948. Its totient is φ = 138924480.

The previous prime is 139073201. The next prime is 139073227. The reversal of 139073213 is 312370931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96393124 + 42680089 = 9818^2 + 6533^2 .

It is a cyclic number.

It is not a de Polignac number, because 139073213 - 2⁴ = 139073197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139073813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72956 + ... + 74837.

It is an arithmetic number, because the mean of its divisors is an integer number (34805487).

Almost surely, 2^139073213 is an apocalyptic number.

It is an amenable number.

139073213 is a deficient number, since it is larger than the sum of its proper divisors (148735).

139073213 is an equidigital number, since it uses as much as digits as its factorization.

139073213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148734.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 139073213 is about 11792.9306366145. The cubic root of 139073213 is about 518.1010782015.

The spelling of 139073213 in words is "one hundred thirty-nine million, seventy-three thousand, two hundred thirteen".